Level-of-Detail Modeling with Artist-Defined Constraints for Photorealistic Hair Rendering

A Level-of-Detail model is proposed to improve the efficiency of hair rendering. The model considers the simplification on both strands density and controlling points of strand curves, which common used uniquely by traditional solutions. On the other hand, we provide artists a novel constraint tool that inspired by existing hair styling method. Artists can determine LOD parameters value in 3D space by their own ideas but not only by viewing distance, whether there is a hair model or not. Another benefit of spatial constraint using is that those separating hair strands can clamp together dynamically if they are growing under working from the same hairstyle constraint. Thus strands can merge into hair wisp model through K-d tree searching for nearest control points. Result shows a notable improvement on photo realistic hair rendering with our model.